Improvement in saw-gumming machines



2 Sheets--Sheet1. .l. M. S M ITH.

Saw-Humming Machine.

No.166,727. Patented Aug-17,1875.

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MPETERS. PHOfd-UWOGRAPHER, WASHIIjGTON, n c.

2 Sheets--Sheet 2.

.l. M. SMITH.

Saw-Summing Machine.

N0.I66,727, I PatentedAug.17,1875.

' 2224f. fizw zz an 2a 52?? Q To all whom it may concern:

Be it known that I, JOSEPH M.-SMITH, of

UNITED- STATES PATENT Qrrrcni Jos'nrn M. SMITH, or ROCHESTER, NEW YORK.

IMPROVEMENT lN S AW-GUMMING MACHINES.

' Specification forming part of Letters Patent No. 166,727, dated August 17, 1875; application filed July 22, 1875.

the city of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Ma chines for Grumming Saws; and I do hereby declare that the following is a full. clear, and

exact description of the construction and operation' of the same, reference being had to the accompanying drawings, in which Figure l is an elevation, partially in section, of my improved machine. Fig. 2 is a plan of the same. Figs. 3, 4, 5, 6, and 7 are detail views. Fig. 8 is a diagram showing the method of gumming the saw.

My improvement relates to a machine for.

gumming saws, in which the burr or millinghead is pressed down to its work by a spring. The invention consists of the construction and arrangement of parts, as hereinafter described.

A represents the main frame, which is constructed of iron, and is provided with a slit,

spring B. Atits rear it has a pivoted rod, 0,

upon which slides the rest D, the latter also having a slit, to, coincident with that of the main frame, through which the saw passes. The rod 0 is pivoted orattached to the mainframe by a set-screw, c, by which means it can be swung upon the pivot to any position to fit the blade of the saw, whether circular or upright; and the rest D is also made adjustable vertically on the rod by means of a setscrew, d. By this means the machine is attached in any desired position, and is therefore adapted to all kinds and shapes of saws. E is a. carriage, which rests and slides on ways ff of the main frame. At its upper end it is attached to the spring B, and at its outer end it has bearings g g, in which rests the shaft h, which carries the burr or milling-tool G. This tool isformed with the usual teeth, and it is clamped upon the shaft between the shoulder is and jam-nut z. The shaft h is driven by a crank, I, at one or both ends. The shaft, at one end, is preferably provided with pins 1 Z, and the crank-eye has oifsets or notches m m and m m on opposite sides.

This crank-eye slips loosely on the end of the shaft, and, when turned forward, the offsets m m engage with the pins ll, and transfer motion to the shaft. By slipping the crank off and putting it on the other way, the ofl'sets m m engage with the pins, and the shaft may be thereby held for unscrewing the nut 73, for the purpose of changing the burr. Differentsized burrs are employed, according to the work to be done. K is a gage, which is attached to the main frame by a set-screw, 0, which passes through a slot of the gage. This gage is of the form shown, and is bent over, so as to rest against the point of the tooth while the gumming is being done, as shown in Fig. 8. When once set to one tooth it gages the position of out of all the rest, and forms a guide to give direction to the milling-tool in its work. The spring B is made of fiat steel, and is wound of conical form,s0 that the leaves 6 6 rest one within another, by which means, when resistance is offered at the apex, the strips are compressed one within another. By this means much range of motion is obtained, so that the spring can feed 7 a shorter length of spring. The extreme lower end of the spring is bent and entered into the slot of a nut, 12, as shown at q, oris attached fast to the nut in'some equivalent manner. The nut itself is screwed upon a screw, L, which passes from the carriage up through the cylinder A. The end of the screw L, which rests in the head-block of the carriage, is made plain or smooth, as shown at r, in order to turn freely therein; but upon the end of the screw outside the carriage is a clamp-nut, s, fitting upon athread of the screw, as shown in Fig. 6.

Upon the upper end of the screw-shaft L is a hand-wheel, t, made fast thereto, by which the screw is turned. Between this and the cylinder A is another hand-wheel, u, which turns loosely upon the screw, and has its bearing or fulcrum against a shoulder, '0, project- 1 The operation is as follows: The machine having been clamped upon the saw-blade, as before described, the screw L is turned by the hand-wheel t down, to bring the burr or milling-tool in position for work. By turning the hand-wheel t, the two clamp-nuts p s are made to bind against the head-block of the carriage, thereby securing the screw and the carriage together as one fixture. Then, the spring being compressed by turning the hand-wheel u backward, the screw and carriage are fed down by the spring-power, forcing the millingtool into its seat, and causing it to cut the socket in the tooth. The spring can be adjusted to a greater pressure at any timeby turning the screw back by the hand-wheel 75, thereby separating the nuts 17 s, and, consequently, forcing back the spring into itself and increasing its power. This increase can be carried to any desired extent, the nut 12 moving back on the screw and carrying the spring with it, and the more it is compressed the greater willbe the pressure against the carriage. It will be seen, therefore, that the hand-wheels t u have two separate functions-v the one compressing or winding up the spring to press with greater force, and the other serving simply to let out the spring to force the carriage downto its work. This forms an essential feature of my invention.

It will-be seen that by thus increasing the power of the spring, I adapt the machine to cut greater or less depths with a single expansion of the spring, as well as to cut with varying power.

The object of the nuts w w is to gage the cut of the milling-tool. When the machine is once set to cut the proper depth on the first tooth, the nuts w w are turned down so as to strike the collar of the hand-wheel a. In cutting each subsequent tooth the hand-wheel is turned back till it strikes these nuts. Each tooth will therefore be cut of the same depth. In changing the machine to out different depths, or to apply greater pressure, these nuts are adjusted with the corresponding adjustrlnent of the screw to produce the desired resu t.

I am aware that a half-elliptic spring has been used in a saw-gummer, with adjustingscrews at the ends to force the cutter to place but such is not the equivalent of my inven-...-

motion or the feeding pressure of the millinghead, as herein described. 7

2. The combination, with the screw L and spring B, of the nut 1), made adjustable upon the screw for the purpose of compressing the spring, and the hand-wheel u, for releasing the said pressure, as shown and described.

3. The combination, with the screw L and spring B, of the clamp-nuts p s, hand-wheels t u, and adj ustin g-nuts w 10, arranged to operate in the manner and for the purpose specified.

4. The combination with the rod 0, pivoted to the main frame and adjustable to difi'erent positions on the pivot, of the rest D, provided with the slit a, to receive the saw, and adjustable vertically upon the rod by means of the set-screw d, as and for the purpose specified.

5. The combination, with the carriage E and burr or milling-tool G, of the gage K, projecting backward over the burr, and resting against the point of the tooth, to form a gage to the cut of the burr, as herein shown and described.

In witness whereofI have hereunto signed my name in the presence of two subscribing witnesses.

J. M. SMITH.

Witnesses:

R. F. OSGOOD, F. B. SMITH. 

